Cylinder lock with key in particular for steering-wheel locks for motor vehicles

ABSTRACT

A cylinder lock for a key having a profiled back for the control of additional functions of the lock upon its withdrawal wherein the key includes a transversely directed projection and the lockcylinder has a longitudinal groove. A cylinder plug, and a keyway, are provided. The projection of the key extends into the longitudinal groove upon insertion and withdrawal. The key projects from the keyway past the surface of the cylinder plug and penetrates into a space beyond the longitudinal groove for maintaining the key in its inserted position. A lock bolt, e.g., of a steering wheel lock, is released by the control member upon entrainment thereof by the key projection.

United States Patent [191 Neale 1 CYLINDER LOCK WITH KEY IN PARTICULARFOR STEERING-WHEEL LOCKS FOR MOTOR VEHICLES [76] Inventor: Charles OwenNeale, Luxor, Saval Park Rd., Dublin, Ireland 22 Filed: Aug. 22, 1973 21Appl.No.:390,492

[30] Foreign Application Priority Data Aug. 28, 1972 Switzerland12697/72 [56] References Cited UNITED STATES PATENTS 6/1937 Gilpin70/185 3/1952 George ..70/363 1 Feb. 4, 1975 Abernathy 70/363 Elchenauer70/252 [57] ABSTRACT A cylinder lock for a key having a profiled backfor the control of additional functions of the lock upon its withdrawalwherein the key includes a transversely directed projection and thelock-cylinder has a longitudinal groove. A cylinder plug, and a keyway,are provided. The projection of the key extends into the longitudinalgroove upon insertion and withdrawal. The key projects from the keywaypast the surface of the cylinder plug and penetrates into a space beyondthe longitudinal groove for maintaining the key in its insertedposition. A lock bolt, e.g., of a steering wheel lock, is released bythe control member upon entrainment thereof by the key projection.

10 Claims, 15 Drawing Figures WWVM 7321 29 2725Rz6l YATENTEDEUWYS SHEEI8 UF 6 FIG. 73

CYLINDER LOCK WITH KEY IN PARTICULAR FOR STEERING-WHEEL LOCKS FOR MOTORVEHICLES The present invention relates to a cylinder lock having a key,which has a profile or formation on its back in order to controladditional functions of the lock upon the withdrawal of the key.

Keys of this type are known for cylinder locks on steering wheels ofmotor vehicles. They have a notch on the back of the key. The free endsof pins or levers which are displaceable radially of the cylindricalplug project a certain distance into the keyway. When the key iswithdrawn, an alarm device can be set or a latch can be set by thedisplacement of the control member which is effected by the withdrawal.Keys having a recess in the vicinity of their tip are also known. If akey without such a recess or a picklock is used to open the cylinderlock, an alarm is sounded as a result of the control member beingdisplaced too far. Control members are also used on cylinder locks toproduce certain electrical indicating functions when the key is removed.All of these designs have the disadvantage that the key must be providedwith an additional notch in addition to the key notches which set thetumblers. This means that the cross-section of the shank of the key issignificantly weakened, which may lead to breakage. A furtherdisadvantage is that even a slight involuntary displacement in thedirection of withdrawal will bring about the control function.Furthermore, the number of possible uses is limited. In addition, theshape of the key cannot serve at the same time to provide increasedprotection against the picking of the lock.

It is an object of the present invention, to provide a cylinder lockhaving a key whose construction is simple, stable, and advantageous inuse in such a way that the key, despite its profile, is not weakened andthe profile can not only be used for the control function but inaddition can also carry out other functions, particularly that ofincreasing the difficulty of picking the lock.

According to the present invention the key has a transversely orientedextension which projects into a longitudinal groove of the lock cylinderhousing upon the insertion and withdrawal of the key, projects beyondthe surface of the cylinder plug from out of the keyway, and enters intoa space beyond the longitudinal groove.

The extension is furthermore advantageously offset with respect to thesurface of the back of the key, so that the rear edge lines arecontinuous even in the region of the extension.

In one advantageous embodiment of the present invention the extension,upon the withdrawal of the key, entrains an axially displaceable controlmember against spring action in the direction of insertion of the key,into the region of a shoulder (control bevel) of the lock cylinderhousing which disengages the control member from the key extension.

The control member can have a hook-shaped extension, one shoulder ofwhich is engaged by the key extension, while its opposite inclinedsurface cooperates with the control bevel of the lock cylinder housing.

During the movement of the key upon its insertion, the bevelled frontedge of the key extension moves over the inclined surface of the controlmember to cam it away and permit the first shoulder to engage.

LII

The control member can be fork-shaped and provided with an entranceslot, open on one side, for the support pin, along which the longer armof the control member slides during the axial driving displacement. in avariant the cylinder barrel has two or more key withdrawal positions andthe longitudinal is aligned with the keyway in only one of thesewithdrawal positions.

Alternatively the control member enters axially into a transverse grooveof a lock latching bolt or the like, which can be displaced by aneccentric on the cylinder barrel.

It is desirable for the control member to be supported in a channel inthe housing on the other side of the entrance slot for the latching boltor the like.

Another embodiment has the end of the axially displaceable controlmember which is directed towards the interior of the lock act, in thedirection of release, on a holding part, which is urged by a spring inradial direction and in withdrawn position locks into the tail of thelock and latching bolt.

The holding part can be of U-shape and spring loaded in the vicinity ofoutwardly directed projections of the arms of the U so that the controlmember cross over the inside of the U.

It is advantageous if, in addition to the axially acting spring, aspring which acts in radially inward direction is associated with thecontrol member. With this variant it is also favorable for the controlmember to have a control head with an obliquely ascending flank on theend facing the interior of the lock.

A holding member for the lock latching bolt tail can be urged in radialdirection by a spring and can engage in transverse recesses of the lockcylinder housing extending laterally from the longitudinal groove of thelock cylinder housing.

The holding member is, advantageously, acted on by the axiallydisplaceable control member.

The lock latching-bolt tail can have a catch arranged in front of theholding member, which moves in front of the extension of a disk which isrotatable together with the barrel of the cylinder, so as to lock samewhen the lock latching bolt is in the locking position.

Despite the profiling of its back the cross-section of the key is notweakened. The difficulty of picking the lock is increased rotation ofthe cylinder barrel is possible only when the key is insertedcompletely. This therefore does away with a method of picking locksemployed by burglars in which a key having key notches which are onlysimilar and not identical is introduced and the lock is opened bydisplacing the key axially a very slight extent andjamming the tumblerpins by turning the key. The size and location of the projection canalso be used for further variation of the profile. The projection couldalso control a special tumbler upon its passage'through the annularspace. This tumbler can serve as additional lock for the cylinder plug.It can be controlled either axially or radially by the projection. if itis controlled after the turning of the extension to a certain angle inthe annular space. then it lies displaced angularly to the keyway andtherefore it is absolutely inaccessible to burglary tools from the frontside. Furthermore, the key is guided better in the lock particularlywhen the extension is offset with respect to the rear edge. The shape ofthe extension particularly on the upper edge and/or on the flank facingthe outer handle of the key, can also contribute to the variation of theprofile in case of a suitable shape of the space beyond the longitudinalgroove. The projection can also serve for the driving along of thelocking member ofthe cylinder lock, so that such a lock can easily beconstructed as a double cylinder in which case locking can be effectedfrom one side even though a key is inserted on the other side. Uponinsertion and withdrawal of the key, the key passes through thelongitudinal groove of the lock cylinder housing. Only after completeinsertion of the key does the extension enter into the space beyond thelongitudinal groove, which permits the rotation of the key together withthe cylinder plug. When the cylinder plug is in an intermediateposition, the extension, in combination with the tumbler pins, preventsthe withdrawal of the key. For this purpose the cylinder plug mustalways be brought into the key withdrawal position in which theextension is then again aligned with the longitudinal groove. In case ofan incorrect attempt at withdrawal the tumbler pins remain protected.Depending on whether the extension is arranged on one key or another ofthe same lock, a control process can also be brought about at a specificmoment which may also differ, without any changes in the cylinder lockbeing necessary. It is also possible to use a second key without aprojection. Although in that case the cylinder lock can be lockedprovided that the extension does not have to lift a locking tumbler, nocontrol function is achieved upon the withdrawal of the key. In the caseof steering wheel locks this would mean that after removal of this keyfollowing a prior actuating of the steering wheel lock the lock does notenter a bolting position as a result of which a vehicle equipped withsuch a steering wheel lock can be moved around. This is suitable, forinstance, for automobile repair shops or-large garages. During thewithdrawal movement, the extension of the key, which is preferably nearthe tip of the key, entrains the spring-loaded control member inform-locked fashion in the withdrawal direction. In this way a path forthe control of the control member which is long as compared with the keywithdrawal path can be obtained. The control path terminates only atpractically complete withdrawal of the key. The opening of the form lockconnection between the control member and the key projection takes placein this case during the final phase of the control path by means of ashoulder on the housing of the lock cylinder. This long path for theactuation of the control member presupposes an intentional operating ofthe cylinder lock. Slight displacements of the key while in withdrawalposition do not cause a complete actuation of the control member. Theuser even notices when the corresponding process is initiated by thecommencement of the driving along of the control member; the completionof this process takes place only substantially later. By the axialdisplacement of the control member a compact design of the cylinder lockcan be achieved with at the same time a stable development of thecontrol member. Essentially, only a longitudinal displacement of thecontrol member is involved, while for the disconnecting of the keyprojection from the control member the letter undergoes only a slightswinging motion. The positive driving along of the control member isachieved by the hook-shaped extension of said member, against theshoulder of which, perpendicular to the direction of movement, the keyprojection acts. At the same time, the hook-shaped extension on the sideopposite the shoulder forms the inclined plane which, in cooperationwith the control bevel of the lock cylinder housing, causes theaforementioned slight swinging movement of the control member. Thiscontrol bevel can, for instance, contribute toward holding the controlmember in this controlled position, so that the introduction of the keycan be carried out more easily. A longitudinal displacement of thecontrol member can then be effected only after a locking actuation.However, it is also possible for the control member to slide back intoits initial position after complete withdrawal of the key and for itshook-shaped extension to then enter into the path of movement of the keyextension. When the key is introduced, the control member is thenbriefly tilted by the bevelled front edge of the key projection andassumes its original position again after passing over the keyprojection. A supporting pin of the lock cylinder housing which isoriented transversely to the control member and serves to support thelonger arm of the fork-shaped control member can contribute towardsfixing the position of the control member.

The present invention makes it possible to provide two or more keywithdrawal positions. The longitudinal groove of the lock cylinderhousing is preferably aligned with the keyway only in one position ofwithdrawal. This means that while the cylinder plug can be actuated by akey which does not have the extension, it has no effect neverthelessupon the control member. The cylinder plug can be brought into its otherwithdrawal positions by means of thekey which has the controlprojection; the key can then not be withdrawn in these positions. Thissolution can be used in various fields, for instance, for thecoin-operated locks of booths in public establishments such as swimmingpools or the like. When the door is opened, the cylinder lock is in theposition in which the key having the key projection cannot be withdrawn.After insertion of a coin and the turning of the cylinder plug into itsother withdrawal position, so as to lock it, the coin is released viathe control member when the key is withdrawn. Furthermore, such acylinder lock could also be used for electrical switch devices. If, onthe other hand, the cylinder lock according to the present invention isused in connection with steering wheel locks having a bolt which emergestransversely from the steering wheel lock housing, the control memberserves as a stop for the locking bolt of the lock. During a lockingoperation of the cylinder plug, the control member, which is urged by aspring in the direction of insertion of the key, enters into thetransverse groove of this lock bolt and blocks its release. Thisblocking is also maintained when the cylinder plug is turned back to thekey withdrawal position. The release of the bolt occurs only afteralmost complete withdrawal of the key. As a result of the long path ofthe control member up to complete release, the control member on theother side of the entrance slot of the lock bolt can enter into a housing channel which lies in the same plane as the longitudinal groove ofthe lock cylinder housing. A bridgeshaped supporting of the controlmember in the blocking position is thus obtained, so that an extremelyeffective stable blocking position of the lock bolt results.

The present invention can also be used very favorably for steering wheellocks whose bolt emerges axially from the steering wheel lock housing.In this case, the control member serves to act upon the holding partsecuring the lock bolt. The holding part is always spring-loaded in thedirection of its engagement position and is displaced in the directionof release by the control member only in the final phase of the keywithdrawal motion. The holding part and control member in this case fitfavorably into the overall design of the steering wheel lock. A radialrecess in the steering wheel lock housing is particularly suited forguidance of the holding part. In accordance with another variant, aholding member spring-mounted in radial direction can also be providedin the lock bolt tail itself. The release of the holding member, in thatcase, could also be produced directly by the projection although thecontrol path would be shorter. In order not to have to do without alonger control path, it is recommended that the holding member bereleased via the axially displaceable control member. A catch may alsobe located ahead of the holding member in the lock bolt tail which,after removal of the key, as a result of the displacement ofthe lockbolt is moved in front of a projection on the disk which is rotatablewith the cylinder barrel. In this way, the lock bolt is secured in itsbolting position and can be displaced only by means of the proper key.

These and other objects become more readily apparent from the followingdetailed description, reference being made to the accompanying drawing,in which:

FIG. I is a longitudinal section through a cylinder lock in accordancewith a first embodiment, with the key fully inserted;

FIG. 2 is a view similar corresponding to that of FIG. 1, but with thekey almost completely withdrawn;

FIG. 3 is an end view of the cylinder lock of FIGS. 1 and 2;

FIG. 4 is a section along the line IV-IV of FIG. 1, with the keyinserted and the cylinder barrel rotated;

FIG. Sis an end view of a cylinder lock with a flat key according to asecond embodiment of the present invention;

FIG. 6 is a section along the line VI-VI of FIG. 5;

FIG. 7 is an elevation of a third embodiment of the present invention,in which the cylinder lock is associated with a steering wheel lock,with its key;

FIG. 8 is a longitudinal section through the steering wheel lock, withthe lock bolt blocked by the control member in the key-withdrawalposition;

FIG. 9 is a section along the line IX--IX of FIG. 8;

FIG. 10 is a section corresponding to FIG. 9, but with the keycompletely withdrawn and with the lock bolt in the blocking position;

FIG. 11 is a longitudinal section, disclosing another embodiment ofasteering wheel lock, with the lock bolt emerging axially from thesteering wheel lock housing;

FIG. 12 is a cross section along the line XIIXII of FIG. 11;

FIG. 13 is a longitudinal section of an embodiment constituting avariation of the steering wheel lock housing with an axially emerginglock bolt, before withdrawal of the key;

FIG. 14 is a fragmentary longitudinal section corresponding to FIG. 13,but with the key withdrawn and with the lock bolt in the boltingposition; and

FIG. 15 is a section along the line XV-XV of FIG. 14.

The cylinder lock of FIGS. 1 to 4 comprises a lock cylinder housing I.In the latter a supporting bore 2 is provided to receive the cylinderbarrel 3. Radial bores of the cylinder plug 3 and lock cylinder housing1 contain pairs of tumbler pins 4 loaded by springs 5.

The cylinder plug 3 has a portion 3' which projects axially beyond therear end 6 of the lock cylinder housing 1. This projecting section 3 ofthe cylinder plug 3 receives the locking member 7, which is connectedfor rotation with the cylinder plug 3 by means of a transverse pin 8.

The cylinder plug 3 also includes a keyway 9.

The cylinder lock of FIGS. 14 has two key withdrawal positions, I andII. For this purpose, another row of tumbler pins 10 is provided in thelock cylinder housing 1, angularly offset from the key withdrawalposition 1.

When the cylinder lock is in the key withdrawal position I, alongitudinal groove 11 of the lock cylinder housing 1 is aligned withthe keyway or slot 9. The control member 12 moves within thislongitudinal groove 11. The control member is fork-shaped and has a slot13, open toward the rear and receiving the bearing pin 14 fixed in thelock cylinder housing I and oriented transversely to the longitudinalgroove 11. In the initial position of the control member 12, the twoarms of the fork l5 and 16 embrace the pin 14.

The end of the control member 12 facing the keyinsertion opening of thecylinder barrel 3 is equipped with a hook-shaped projection 17. When thekey is not inserted, the projection extends up to the surface of thecylinder plug and may also extend into the keyway 9 to a certain extent.The hook-shaped projection 17 forms a shoulder oriented radially withrespect to the cylinder barrel 3. Opposite this shoulder 18 is aninclined plane 19. The control member 12 is acted on in the direction ofinsertion of the key by a compression spring 20. One end of this spring20 is seated in a blind hole 21 of the control member and the other endis supported against the end wall 22 of the longitudinal groove 11 ofthe lock cylinder housing 1. The compression spring 20 is inclined withrespect to the path of motion of the control member 12, so that thelatter is displaced rearwardly in a longitudinal direction and is swungin a counterclockwise direction by the spring 20. The bearing pin 14constitutes the pivot point for the control member 12.

The end wall 22 has a control bevel 23 directed toward the keyway 9 andleaves free a channel 24 adjacent to the cylinder surface and alignedwith the longitudinal groove 11.

The channel 24 and the connecting longitudinal groove 11 permit theinsertion of the key 25. The key has a transverse projection 26 in theregion of its tip on its rear surface opposite to the key notches. Thisprojection 26 forms a bevelled front edge 27, which merges with thecorresponding inclined flank of the key tip. Opposite the front edge 27is the entraining shoulder 28 of the projection 26.

In order to permit the complete insertion of the key, a recess 29 of thelocking member 7 is aligned with the keyway 9.

Before the insertion of the key 25, the control member is in theposition shown in FIG. 1. The projection 26 of the key, which projectsinto the path of motion of the key when the key is inserted, passes withits bevelled front edge 27 over the inclined plane 19 of the controlmember and cams the control member 12 in a clockwise sense. Afterpassing over the extension 17 of the control member 12, the latterreturns to its initial position in accordance with FIG. 1. In thisposition, the pairs of tumbler pins have been set in such manner by thekey notches, that their plane of separation is at the level of thecylinder plug surface. The key projection 26 is now located in a space Rbeyond the longitudinal groove 11. This space R, in the embodimentshown, is formed by the boundary of the lock cylinder housing 1. The keyprojection 26 is therefore located beyond the rear end 6 of the lockcylinder housing 1. The cylinder plug can now be rotated into itsdifferent positions. If the cylinder plug is brought into thekey-withdrawal position II (see FIG. 4), then the key 25 cannot bewithdrawn, since this is prevented by the key projection 26. Awithdrawal of the key is possible only in the key withdrawal position I.In that case, the keyway 9 is again aligned with the longitudinal groove11 of the lock cylinder housing 1. During the withdrawal motion of thekey, the driving shoulder 28 of the key projection 26 acts on theshoulder 18 of the hook-shaped projection 17 of the control member 12.In this process, the control member is displaced in a longitudinaldirection until its inclined plane 19 encounters the control bevel 23 ofthe lock cylinder housing 1. As a result of the mounting motion of theinclined plane 19 on the control bevel 23, the control member ispositively turned, so that it takes on the position shown in FIG. 2 andthereby permits the complete withdrawal of the key 25. During this keywithdrawal motion, the longer arm 16 of the fork-shaped control memberslides along the pin 14. After complete withdrawal, the control member12 then returns to its original position as shown in FIG. 1. In thisposition, locking can be carried out with a key with no projection.However, in a locking of this type, the control member 12 does notoperate. A key of this type can then also be withdrawn in the withdrawalposition II.

In FIGS. and 6, the control member is associated with a cylinder lockwith a flat-key design. The cylinder plug 30 shows a key 9' orientedtransversely to the tumbler pins.

Two rows of tumbler pins 4 are provided, as shown in FIG. 6, in twoadjacent rows, in such a way that a staggered arrangement is obtained.The tumbler pins are profiled in order to make them nonrotatable. Thekeyway 9 is closed off on one side by a filler body 31 into which thekeyway 9' extends. However, the width of the keyway 9' in the fillerbody 31 is less than the thickness of the control member 12, so that thelatter is positively supported in the plane of the cylinder plugsurface.

The key 25 associated with this cylinder lock also has a projection 26which, during insertion, passes over the extension 17 of the controlmember, which projection 26 moves the control member 12 in the directionof withdrawal of the key when the key is withdrawn. The projection isthinner than the rest of the key thickness, so that the projection isrecessed stepwise with respect to the back of the key from which itextends. This ensures a cleaner guidance, despite the longitudinalgroove of the housing. This recessed form of the projection can also beprovided for the embodiment according to FIGS. 1 to 4, if in particular,despite the guidance of the key provided by its curved profile in thatcase, one wishes to achieve a well-fitting guidance of the back.

For the key 25 shown, the depressions setting the tumbler pins arelocated on one of the broad sides of the key shank.

In the system of FIGS. 7 to 10, the device of the present invention hasbeen incorporated in a steering wheel lock. This contains the steeringwheel lock housing 32 which receives the lock cylinder housing 1'.

The cylinder barrel 3 mounted in the lock cylinder housing 1' isconnected at its rear end with the eccentric 33, which controls a lockbolt 36 displaceable in a transverse entrance slot 34 of the steeringwheel lock housing 32 and acted upon by the bolt spring 35 (FIGS. 9 and10). The lock bolt 36 consists of a frame-shaped bolt tail 37 and a bolthead 38 pivotally connected therewith which, in the blocking position,engages in a recess in the steering column.

The bolt tail 37 contains an opening 39 for the shaft 40 secured to theeccentric 33. The shaft 40 passes through a bore 41 of the steeringwheel lock housing 32 and engages the ignition starting switch 42, whoseswitch cylinder, which is not shown in detail, is turned in accordancewith the locking positions of the cylinder plug 3.

The lock cylinder housing 1' is also equipped with a longitudinal groove11, which is aligned with a corresponding housing channel 32 of thesteering wheel lock housing 32. The housing channel 32 extends up toboth sides of the entrance groove 34 of the lock bolt 36.

In the control member 12 used in this embodiment the shorter arm ismissing. The longer arm 16 has at its end the locking projection 44,which has a larger cross section. The back 43 of the control member 12is curved.

The locking projection 44 of the control member 12 engages in atransverse groove 45 of the lock bolt 36.

In the blocking position, the control member 12 is in the position shownby the broken lines in FIG. 9. The transverse groove 45 of the lock bolt36 is therefore not in the same plane as the control member 12, so thatthe latter rests against the broad surface of the lock bolt 36.

If the key 25, which has the projection 26 on the tip of the key, is nowinserted in the keyway 9, the projection 26 moves over the extension 17of the control member. In the fully inserted position of the key 25, theprojection 26 projects into the space R beyond the longitudinal groove11, so that the cylinder plug can then be rotated. Upon rotation of thecylinder plug, the eccentric 33 displaces the lock bolt 36, after whichthe transverse groove 45 of the lock bolt 36 is aligned with the lockingprojection 44 of the control member 12. The compression spring 20 nowdisplaces the control member 12' into the position shown in solid linesin FIGS. 8 and 9. The arm 16 of the control member 12' is supported onboth sides of the lock bolt in this position, so that this controlmember 12 can withstand high transverse forces, which significantlyincreases the reliability of a steering wheel lock of this type. Whenthe cylinder plug is turned back into its key withdrawal position,although the eccentric 33 releases the lock bolt 36, the latter is stillheld by the control member 12'. During the key withdrawal motion, thecontrol member 12 releases the lock bolt only during the last phase ofthe key withdrawal, during which last withdrawal phase the controlmember 12 is turned into the position shown by the broken line in FIG. 8by means of the control bevel 23 of the lock cylinder housing 1. Thelock bolt 36 can then spring ahead into the position shown in FIG. 10.

The embodiment according to FIGS. 11 and 12 is a steering wheel lock, inwhich the lock bolt 46 emerges axially from the tubular steering wheellock housing 47. The lock bolt tail 46' forms a hook 48, which engagesin a control slot 49 of the eccentric 33.

The lock bolt 46 is under the action of a compression spring 35, whichurges it in the direction of engagement. The lock bolt 46 is in the sameplane as the longitudinal groove 11 of the lock cylinder housing 1.

The axially displaceable control member 12 moves within thislongitudinal groove 11. The control member 12" is acted on in axialdirection by the compression spring 20. The urging in radially inwarddirection of the control member 12 is produced by a compression spring50, which is supported in an axial recess 52 of the steering wheel lockhousing 47 by means of a sliding pin 51.

At its end of smaller cross section which faces the inside of the lock,the control member 12" has a control head 53 with an ascending inclinedflank 54. This control head 53 at the end of the control member 12' isdirected toward the inside of the lock are supported against the back 55of the lock bolt tail 46'. This back 55 has a detent recess 56 which,when the lock bolt is drawn back (see FIG. 11) is aligned with a radialrecess 57 of the steering wheel lock housing 47. A springmounted,U-shaped holding part (detent) 58 moves in this radial recess 57. TheU-arms of the holding part 58 are equipped with outwardly directedprojections 60, which are acted on by compression springs 61. The radialrecess 57 is closed in the region of the compression springs 61 by meansof plugs 62.

The inner space 63 of the U is crossed by the end of the holding part 58which is directed toward the inside of the lock.

With the lock bolt 46 drawn back, the U-arms 59 enter into thetransverse recess 56 of the lock bolt 46. This means that, after turningthe cylinder plug back from its active positions to the holdingposition, the lock bolt 46 is secured in the drawn-back position by theholding part 58. During withdrawal of the key and the simultaneousdisplacement of the control member 12", in the final phase of the keywithdrawal motion, the holding part 58 is displaced in radially outwarddirection via the obliquely ascending flank 54 of the control head 53,so that the U-arms 59 release the lock bolt 46 to spring ahead into itsblocking position. During this forward movement, the hook 48 of the lockbolt 46 passes over a spring mounted catch 64 of the eccentric 33. Thiscatch 64 prevents the lock bolt 46 from being pressed back from theoutside when it is in the blocking position.

The fifth embodiment according to FIGS. 13 to also shows a steeringwheel lock with an axially emerging lock bolt 46. In this embodiment,the lock bolt tail 46' is continued beyond the hook 46. A holding member66, which is displaceable in a direction radially to the lock cylinderhousing, is mounted at the free end of the lock bolt tail 46. Thisholding member 66 is acted on by the compression spring 67. With thelock bolt drawn back (see FIG. 13), the holding member 66 engagesarrestingly into transverse recesses 68 of the lock cylinder housing 1'.The transverse recesses 68 extend laterally from the longitudinal groove11 of the lock cylinder housing 1.

The control member 12 is associated with the holding member 66. Thecontrol member is acted on by the inclined compression spring Thecontrol member 12" is guided by a pin 69 oriented transversely to thelongitudinal groove 11, which moves in longitudinal slots 70 of thelockcylinder housing 1.

5 A catch 71 is mounted in front of the holding member 66 in the lockbolt tail 46. This catch 71 is springloaded in radial direction and isequipped with a catch bevel 72. The catch 71 is thus arranged in anonrotatable manner. A projection 73 of a disk 74 is associated withthis catch 71. The disk 74 is located nonrotatably on the cylinder plug3.

When the key is withdrawn in the position of the steering wheel lockaccording to FIG. 13, the key projection 26 displaces the control member12". In this process, the inclined plane 19 of the control member 12comes against the control bevel 23 of the lock cylinder housing 1. As aresult, the control member 12" is turned about the pin 69 and acts onthe holding member 66. The latter is lifted out of the transverserecesses 68 of the lock cylinder housing 1, so that the lock bolt 46 canspring ahead. In this process, the catch 71, as a result of the catchbevel 72, passes over the projection 73 of the disk 74. After the lockbolt 46 has sprung fully ahead, the catch is then located in front ofthe projection 73 of the disk 74 (see FIG. 14) and thus prevents apressing back of the lock bolt 46. Only when the cylinder plug undergoesa locking rotation does the projection 73 of the disk 74 release thelock bolt 46 for a return displacement.

I claim:

1. A cylinder lock comprising:

a key having a shank provided along one side with lock-actuatingformations and another side provided with a lateral projection;

a lock-cylinder housing;

a lock barrel rotatable in said housing and having a keyway adapted toreceive the shank of said key;

means between said housing and said barrel cooperating with saidformations for enabling relative rotation of said barrel and saidhousing upon inser tion of said key in said keyway, said housing beingformed with a longitudinal groove, said projection passing through saidgroove upon insertion of said key into said keyway, said housing beingformed with a space beyond said groove accommodating said projectionupon full insertion of said key into said keyway to permit relativerotation of said barrel and said housing, said projection blocking suchrotation while being disposed in said groove; and

control means actuated by said projection and external of said keywayfor operating a further device.

2. The cylinder lock defined in claim 1 wherein said control meanscomprises:

a lever mounted in said groove and axially and radially displaceabletherein, said lever being formed with a shoulder engageable by saidprojection upon withdrawal of said key from said keyway to entrain saidlever therewith;

60 cammin g means on said housing engageable with said lever fordisengaging same from said projection immediately prior to fullwithdrawal of said key from said keyway; and

spring means biasing said lever in the direction of insertion of saidkey.

3. The lock defined in claim 2 wherein said shoulder is formed as aprojection on said lever and said projection on said lever has a beveledsurface engageable with said camming means, said camming means beingformed as a beveled surface on said housing.

4. The lock defined in claim 2 wherein said key has a beveled front endcammingly engageable with said lever for deflecting same out of saidkeyway.

5. The lock defined in claim 2 wherein said lever is provided with anelongated slot, said lock further comprising a pin received in said slotfor guiding said lever.

6. The lock defined in claim 2 wherein said barrel and said housingdefine two relatively angularly offset positions enabling withdrawal ofa key, said groove being aligned with said keyway in only one of saidpositions.

7. The lock defined in claim 2 wherein said further device is a lockbolt, said lock bolt having a transverse groove, said lever extendingaxially into said groove and said barrel being formed with an eccentricfor displacing said bolt.

8. The lock defined in claim 2 wherein said device includes a lock bolt,further comprising detent means for retaining said lock bolt in adisengaged position, said lever being engageable with said detent meansfor releasing said lock bolt.

9. The lock defined in claim 8 wherein said detent means includes abridge member and a pair of springs biasing said bridge member intoengagement with said bolt, said lever engaging said bridge memberbetween its biasing springs.

10. The lock defined in claim 2 wherein a first spring bears axiallyupon said lever and a second spring bears radially thereon.

##ara m

1. A cylinder lock comprising: a key having a shank provided along oneside with lock-actuating formations and another side provided with alateral projection; a lock-cylinder housing; a lock barrel rotatable insaid housing and having a keyway adapted to receive the shank of saidkey; means between said housing and said barrel cooperating with saidformations for enabling relative rotation of said barrel and saidhousing upon insertion of said key in said keyway, said housing beingformed with a longitudinal groove, said projection passing through saidgroove upon insertion of said key into said keyway, said housing beingformed with a space beyond said groove accommodating said projectionupon full insertion of said key into said keyway to permit relativerotation of said barrel and said housing, said projection blocking suchrotation while being disposed in said groove; and control means actuatedby said projection and external of said keyway for operating a furtherdevice.
 2. The cylinder lock defined in claim 1 wherein said controlmeans comprises: a lever mounted in said groove and axially and radiallydisplaceable therein, said lever being formed with a shoulder engageableby said projection upon withdrawal of said key from said keyway toentrain said lever therewith; camming means on said housing engageablewith said lever for disengaging same from said projection immediatelyprior to full withdrawal of said key from said keyway; and spring meansbiasing said lever in the direction of insertion of said key.
 3. Thelock defined in claim 2 wherein said shoulder is formed as a projectionon said lever and said projection on said lever has a beveled surfaceengageable with said camming means, said camming means being formed as abeveled surface oN said housing.
 4. The lock defined in claim 2 whereinsaid key has a beveled front end cammingly engageable with said leverfor deflecting same out of said keyway.
 5. The lock defined in claim 2wherein said lever is provided with an elongated slot, said lock furthercomprising a pin received in said slot for guiding said lever.
 6. Thelock defined in claim 2 wherein said barrel and said housing define tworelatively angularly offset positions enabling withdrawal of a key, saidgroove being aligned with said keyway in only one of said positions. 7.The lock defined in claim 2 wherein said further device is a lock bolt,said lock bolt having a transverse groove, said lever extending axiallyinto said groove and said barrel being formed with an eccentric fordisplacing said bolt.
 8. The lock defined in claim 2 wherein said deviceincludes a lock bolt, further comprising detent means for retaining saidlock bolt in a disengaged position, said lever being engageable withsaid detent means for releasing said lock bolt.
 9. The lock defined inclaim 8 wherein said detent means includes a bridge member and a pair ofsprings biasing said bridge member into engagement with said bolt, saidlever engaging said bridge member between its biasing springs.
 10. Thelock defined in claim 2 wherein a first spring bears axially upon saidlever and a second spring bears radially thereon.